Generally service such as ssh, screen, expect, telnet etc use pty (pseudo-terminals) in master – slave mode for login and other purposes. If pty setting is too low many users will not able to login to system using ssh or other commands. In this tip I will explain how to increase the maximum number of [...]
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While administrating a box, you may wanted to find out what a processes is doing and find out how many file descriptors (fd) are being used. You will surprised to find out that process does open all sort of files:
=> Actual log file
=> /dev files
=> UNIX Sockets
=> Network sockets
=> Library files /lib /lib64
=> Executables and other programs etc
In this quick post, I will explain how to to count how many file descriptors are currently in use on your Linux server system.
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You should always aware of maximum amount of memory and maximum number of CPU supported by Linux systems / server.
This is an essential task for making out decisions. You must consider at least AMD and Intel platforms, tested under RHEL 5 only:
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Q. I would like to restrict number of CPU activated for some software licensing issues under Linux kernel 2.6.xx.. How can I limit the number of CPUs activated in SMP mode? A. Pass a special parameter called maxcpus to kernel. It specify maximum number of processors that an SMP Linux kernel should make use of. [...]
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/var/log/faillog is a log file for failed login attempts. This file maintains a count of login failures and the limits for each account. The file is fixed length record, indexed by numerical ID. Each record contains the count of login failures since the last successful login; the maximum number of failures before the account is [...]
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